Round Lot Jump to the manual 100 shares = 1 lot

The bear call spread: why the second leg exists and what it fixes

A bear call spread sells one call and buys another further out, both expiring together. The sale collects a premium; the purchase places a ceiling on what can go wrong. Both numbers are known before the position exists, which is the entire point of the structure.

Written under the standing byline J. Marchetti options and execution Published

Legs
2, same expiry
Max gain
net credit
Max loss
width − credit
Two thin brass straightedges crossed at a shallow angle over dark ridged paper, casting a narrow wedge of shadow between them
Two legs, one expiry. The distance between the strikes is the whole risk, and it is chosen when the position is opened.

The two legs, and what each one does

The short leg is a call sold at the lower strike. On its own it would collect a premium and carry an obligation with no ceiling, because a share price can keep climbing. The long leg is a call bought at a higher strike, same expiry, and it exists to end that. Above the upper strike, whatever you owe on the short leg is matched by what you are owed on the long one.

The premium received on the short leg exceeds the premium paid on the long leg, because the lower strike is closer to the money. The difference is the net credit, and it is collected when the position opens. From that moment both extremes of the outcome are fixed numbers rather than open questions.

Net credit, width and maximum loss

Take a call sold at 55 for 3 and a call bought at 60 for 1. The net credit is 2 per share, or 200 dollars for one spread. The width between the strikes is 5. Maximum loss is the width minus the credit: 5 − 2 = 3 per share, or 300 dollars. Maximum gain is the credit itself, 2, kept whenever both calls expire worthless.

Three quantities describe the position completely: the credit, the width, and their difference. There is no share price at which the loss exceeds 3 per share, and none at which the gain exceeds 2. Selling a call alone gives up the first of those guarantees, which is why the second leg is worth its cost.

Where the ratio comes fromThis example risks 3 to make 2, and that ratio is not a flaw in the choice of strikes; it is the market pricing the probability. Structures that pay more relative to their risk do so because the outcome that loses is more likely. No arrangement of strikes escapes that; it only moves along it.

Both legs at expiry

Below the lower strike, neither call has intrinsic value and both expire. The credit is kept in full and nothing is assigned. Between the strikes, the short call is in the money and will be exercised against you while the long call expires worthless. You deliver 100 shares at the lower strike, and only part of the credit survives. Above the upper strike, both are exercised: shares are called away at 55 and you buy them at 60, a difference of 5 per share against a credit of 2, which is the maximum loss.

The middle case is the one that surprises people, because it produces an assignment on one leg while the other provides nothing. Between the strikes the long call is still out of the money; a right to buy at 60 is worth nothing when the price is 57. So it does not offset the assignment, it only limits how bad the case above it can get.

40 45 50 55 60 65 70 -15 -10 -5 0 +5 break-even 57 strike 55 profit / loss per share (USD) share price at expiry (USD)
The short leg on its own: capped gain of 2, break-even at 57, and losses that keep growing above it. The long call at 60 truncates that line, which is precisely the job it was bought for.

Assignment while both legs are live

Early assignment on the short leg is possible at any time, and it does not close the spread. You would be short 100 shares against a long call that still has time left on it. That is a coherent position, but it is not the one you opened, and it carries a margin requirement the original spread did not.

The usual mechanical response is to exercise the long call to cover, which crystallizes the maximum loss immediately rather than waiting for expiry. Knowing that before it happens is what separates a defined-risk position that behaves as designed from one that gets managed badly under time pressure.

FAQ

Questions this page raises

Why not just sell the call and skip the second leg?

Because the loss on a lone short call is not bounded by anything you have already committed. The long call converts an unlimited exposure into a known maximum, and its premium is the price of that conversion. Brokers price the difference too: a spread sits in a lower approval tier than an uncovered call.

Is a bear call spread bearish?

It profits when the share stays below the lower strike, so it does not require a fall: only the absence of a rise past that point. That makes it neutral-to-bearish rather than bearish, and the distinction matters because a flat market is a winning outcome here and a losing one for a bought put.

What is the width and how do I choose it?

The width is the distance between the strikes and it sets the maximum loss directly. A wider spread collects more credit and risks more; a narrower one does the reverse. It is a size decision, not a view, and it should be made against how much loss is acceptable rather than how much credit looks attractive.

Can both legs be assigned at once?

At expiry, yes: above the upper strike both are exercised and the position resolves at the maximum loss. That is the designed outcome of the worst case, not a malfunction.

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